Problem 11.7: A facility reports Rising condenser approach
From Chapter 11 Problem Set. Level 2: Applied Thinking.
Question
A facility reports:
- Rising condenser approach
- Higher coupon corrosion rates
- Higher biocide demand
- Visible silt in the tower basin
Use the free body diagram approach to identify the most likely root cause and explain how one problem can create all four symptoms.
Answer
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Most likely root cause: failure of solids management, often due to filtration bypass, poor basin cleanliness, or excessive suspended loading.
A strong cascade explanation would be:
- Solids accumulate in the basin and low-flow zones
- Deposits form on heat-transfer and metal surfaces
- Deposits create differential aeration and under-deposit corrosion
- Deposits shelter biology, which raises biocide demand
- Deposit and biofilm insulation increase condenser approach
This is exactly the kind of multi-symptom problem that the free body diagram is meant to untangle.